Method for driving electro-optical display device

A method for driving a matrix type electro-optical device comprising an electro-optical modulation material which has different optical response states depending on the direction of an applied electric field, including an AC stabilizing field, and which is interposed between a plurality of scan electrodes and a plurality of control electrodes to form optical elements at intersecting points of each electrode, the method comprising the steps of:

• selectively supplying an initializing signal and a succeeding selection signal to one of the scan electrodes and supplying a non-selection signal to the one scan electrode when the initializing signal and the selection signal are not supplied thereto;
• supplying data signals to the control electrodes synchronously with the supply of the selection signal to the one scan electrode for specifying the optical response state of each of the optical elements at the one scan electrode;
• applying an initializing pulse group consisting of a plurality of pulses to the optical elements to optically initialize the optical elements by means of a potential difference between the initializing signal and the data signals;
• applying a first pulse group to the optical elements by means of a potential difference between the selection signal and the data signals to set the optical elements to desired optical response states;
• and
• maintaining the optical response states of the optical elements utilizing an AC stabilizing effect by applying a second pulse group to the optical elements by means of a potential difference between the non-selection signal and the data signals;
• the initializing pulse group setting the optical elements to a light transmitting state or a light-shading state, and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse;
• the first pulse group containing writing pulses for setting the optical elements to the desired optical response states initialized by the initializing pulse group and wherein a symmetrical negative polarity pulse necessarily exists opposite each positive polarity pulse;
• and
• the second pulse group comprises pulses having a frequency adequate for maintaining optical response states of the optical elements by an AC stabilizing effect and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse.

A method for driving a matrix type electro-optical device comprising an electro-optical modulation material which has different optical response states depending on the direction of an applied electric field, and which is interposed between a plurality of scan electrodes and a plurality of control electrodes to form optical elements at intersecting points of each electrode, the method comprising the steps of:

• selectively supplying an initializing signal and a succeeding selection signal to one of the scan electrodes and supplying a non-selection signal to the one scan electrode when the initializing signal and the selection signal are not supplied thereto;
• supplying data signals to the control electrodes synchronously with the supply of the selection signal to the one scan electrode for specifying the optical response state of each of the optical elements at the one scan electrode;
• applying an initializing pulse group consisting of a plurality of pulses to the optical elements to optically initialize the optical elements by means of a potential difference between the initializing signal and the data signals;
• applying a first pulse group to the optical elements by means of a potential difference between the selection signal and the data signals to set the optical elements to desired optical response states;
• and
• maintaining the optical response states of the optical elements by utilizing an AC stabilizing effect by applying a second pulse group to the optical elements by means of a potential difference between the non-selection signal and the data signals;
• the initializing pulse group setting the optical elements to a light transmitting state or a light-shading state, and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse;
• the first pulse group containing writing pulses for setting the optical elements to the desired optical response states or pulses for maintaining the optical response states initialized by the initializing pulse group and wherein a symmetrical negative polarity pulse necessarily exists opposite each positive polarity pulse;
• and
• the second pulse group comprising pulses having a frequency adequate for maintaining optical response states of the optical elements by an AC stabilizing effect and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse.

A method for driving a matrix type electro-optical device comprising an electro-optical modulation material which has different optical response states depending on the direction of an applied electric field, including an AC stabilizing field, and which is interposed between a plurality of scan electrodes and a plurality of control electrodes to form optical elements at intersecting points of each electrode, the method comprising the steps of:

• selectively supplying a plurality of initializing pulses and a succeeding selection signal to one of the scan electrodes and supplying a non-selection signal to the one scan electrode when the initializing pulses and the selection signal are not supplied, wherein the time duration of each initializing pulse is equal to the time duration of individual pulses of the selection signal;
• supplying data signals to the control electrodes synchronously with the supply of the selection signal to the one scan electrode for specifying the optical response state of each of the optical elements at the one scan electrode;
• applying an initializing pulse group consisting of a plurality of pulses to the optical elements to optically initialize the optical elements by means of a potential difference between the initializing signal and the data signals;
• applying a first pulse group to the optical elements by means of a potential difference between the selection signal and the data signals to set the optical elements to desired optical response states;
• and
• maintaining the optical response states of the optical elements utilizing an AC stabilizing effect by applying a second pulse group to the optical elements by means of a potential difference between the non-selection signal and the data signals;
• the initializing pulse group setting the optical elements to a light transmitting state or a light-shading state, and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse;
• the first pulse group containing one of a plurality of writing pulses for setting the optical elements to the desired optical response states and a plurality of holding pulses for maintaining the optical response states initialized by the initializing pulse group and wherein a symmetrical negative polarity pulse necessarily exists opposite to each positive polarity pulse;
• and
• the second pulse group comprising pulses having a frequency adequate for maintaining optical response states of the optical elements utilizing an AC stabilizing effect, and wherein a symmetrical negative polarity pulse necessarily exists opposite each positive polarity pulse.

A method for driving a ferroelectric liquid crystal optical matrix having a plurality of pixels, comprising the steps of:

• applying to a group of pixels a first pulse group containing pulses having a first initializing pulse to set the liquid crystal to a saturated response condition and a second initializing pulse to set the liquid crystal to a saturated reverse response condition, the first initializing pulse and the second initializing pulse having the same pulse waveform but opposite polarities;
• applying to selected pixels within the group of pixels a second pulse group successively after applying the first pulse group, the second pulse group containing pulses having the same waveform but different polarities so as to hold the liquid crystal to the saturated reverse response condition;
• applying to the other pixels within the group of pixels a third pulse group successively after applying the first pulse group, the third pulse group containing pulses having the same waveform but different polarities so as to change the liquid crystal to a saturated response condition;
• and
• applying to the group of pixels an AC signal successively after applying the second pulse group or the third pulse group, the AC signal having a DC bias voltage equal to 0 to thereby stabilize the response condition of the liquid crystal.